Drug smugglers using drones…

Border Patrol agents are increasingly worried about the threat from drug-cartel-flown drones, after agents spotted 13 drones suspected of carrying drugs across one section of the U.S.-Mexico border in just one four-day period in November.

Cartels are aware that the U.S. lacks the ability to detect the drones, much less to interdict them, making them a choice method for smuggling high-dollar hard drugs into the country, agents said.